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Energies 2017, 10(3), 296; doi:10.3390/en10030296

Isolated DC-DC Converter for Bidirectional Power Flow Controlling with Soft-Switching Feature and High Step-Up/Down Voltage Conversion

1
Department of Electronic Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung 82445, Taiwan
2
Department of Electrical Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Jayanta Deb Mondol
Received: 29 December 2016 / Accepted: 27 February 2017 / Published: 2 March 2017
(This article belongs to the Special Issue Grid-Connected Photovoltaic Systems)
View Full-Text   |   Download PDF [7865 KB, uploaded 7 March 2017]   |  

Abstract

In this paper, a novel isolated bidirectional DC-DC converter is proposed, which is able to accomplish high step-up/down voltage conversion. Therefore, it is suitable for hybrid electric vehicle, fuel cell vehicle, energy backup system, and grid-system applications. The proposed converter incorporates a coupled inductor to behave forward-and-flyback energy conversion for high voltage ratio and provide galvanic isolation. The energy stored in the leakage inductor of the coupled inductor can be recycled without the use of additional snubber mechanism or clamped circuit. No matter in step-up or step-down mode, all power switches can operate with soft switching. Moreover, there is a inherit feature that metal–oxide–semiconductor field-effect transistors (MOSFETs) with smaller on-state resistance can be adopted because of lower voltage endurance at primary side. Operation principle, voltage ratio derivation, and inductor design are thoroughly described in this paper. In addition, a 1-kW prototype is implemented to validate the feasibility and correctness of the converter. Experimental results indicate that the peak efficiencies in step-up and step-down modes can be up to 95.4% and 93.6%, respectively. View Full-Text
Keywords: bidirectional DC-DC converter; high voltage conversion ratio; galvanic isolation; soft-switching feature bidirectional DC-DC converter; high voltage conversion ratio; galvanic isolation; soft-switching feature
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Shen, C.-L.; Shen, Y.-S.; Tsai, C.-T. Isolated DC-DC Converter for Bidirectional Power Flow Controlling with Soft-Switching Feature and High Step-Up/Down Voltage Conversion. Energies 2017, 10, 296.

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